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Preparation process of a high-aluminum, titanium-deformed superalloy

A technology of deformed superalloy and preparation process, applied in the preparation process of titanium deformed superalloy and high aluminum field, can solve the problems of deterioration of alloy smelting performance, adverse effect of processing performance, shrinkage of alloy hot working window, etc., and achieve excellent high temperature strength performance. , the effect of low preparation cost and excellent high temperature mechanical properties

Active Publication Date: 2021-11-19
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, elements such as Al and Ti have high activity, and their addition to the alloy will cause the fluidity of molten steel to decrease, which will eventually lead to a sharp deterioration in the smelting performance of the alloy.
In addition, when the content of Al and Ti elements increases, it will also lead to a narrowing of the thermal processing window of the alloy, which will adversely affect its processing properties.
At present, the superalloys with high Al and Ti content are generally cast superalloys, and in order to avoid problems such as element burning, the triple smelting process of vacuum induction melting, electroslag remelting and vacuum self-consumption is generally used, which greatly increases the alloy The difficulty and cost of smelting preparation

Method used

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  • Preparation process of a high-aluminum, titanium-deformed superalloy
  • Preparation process of a high-aluminum, titanium-deformed superalloy
  • Preparation process of a high-aluminum, titanium-deformed superalloy

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preparation example Construction

[0031] The above-mentioned alloy preparation process mainly includes three steps of electric arc melting, billet forging and high temperature rolling.

[0032] (1) Arc smelting: The alloy is smelted in an induction arc furnace, and the vacuum degree is controlled within the range of 0.3-0.5Pa. After the Cr, Co, Ni, W, Nb, Si and Mn elements are completely melted, it is smelted for 0.5-1h, and then Add Al, Ti, B, Zr, C, N and Re under the protection of argon to obtain ingots;

[0033] Specifically, after Cr, Co, Ni, W, Nb, Si and Mn alloy raw materials are completely melted, coke is added for deoxidation. Carry out secondary deoxidation, and finally add Al, Ti, B, Zr, C, N and Re burnable elements under the protection of argon, stir for 5-10 minutes and then release from the furnace. Alloy casting adopts metal molds, and after casting, aluminum heating agent is used to cover the surface of molten steel (it only needs to cover the surface of molten steel), so as to reduce the s...

Embodiment 1

[0042] The deformed superalloy with high Al and Ti content in this embodiment includes: C: 0.08%, Cr: 20%, Co: 14.5%, Mn: 0.3%, Si: 0.2%, Nb: 0.5%, W : 4.8%, Ti: 1.5%, Al: 3.5%, B: 0.002%, Zr: 0.02%, and the balance is Ni.

[0043] The magnesium oxide basic furnace lining is used for smelting, the furnace is washed with pure nickel, and the alloy raw materials are shot blasted before being added. Subsequently, the induction arc furnace is used for smelting, and the vacuum degree is controlled at about 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, smelt for 40 minutes, and before adding Al, Ti, B, Zr, C High-purity argon protection. Cr, Co, Ni, W, Nb and other alloy raw materials are completely melted and added to coke for deoxidation. The added mass is 40% of the mass of C elements in the alloy raw materials. After completion, Ni-Mg alloy is added for secondary deoxidation, and finally Al, Ti, B, Zr, C and other elements that are easy to burn out ...

Embodiment 2

[0047] The wrought superalloy with high Al and Ti content in this embodiment includes: C: 0.07%, Cr: 22.5%, Co: 14.5%, Mn: 0.2%, Si: 0.3%, Nb: 0.6%, W : 3.8%, Ti: 2.5%, Al: 2.5%, B: 0.002%, Zr: 0.02%, and the balance is Ni. The magnesium oxide basic furnace lining is used for smelting, the furnace is washed with pure nickel, and the alloy raw materials are shot blasted before being added. Subsequently, the induction arc furnace is used for smelting, and the vacuum degree is controlled at about 0.35Pa. After Cr, Co, Ni, W, Nb and other elements are completely melted, smelt for 40 minutes, and before adding Al, Ti, B, Zr, C High-purity argon protection. Cr, Co, Ni, W, Nb and other alloy raw materials are completely melted and added to coke for deoxidation. The added mass is 40% of the mass of C elements in the alloy raw materials. After completion, Ni-Mg alloy is added for secondary deoxidation, and finally Al, Ti, B, Zr, C and other elements that are easy to burn out are stir...

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Abstract

A preparation process for high-alumina and titanium deformed superalloys, comprising C: 0.05-0.08%, Cr: 20-24%, Co: 10-15%, Mn: ≤0.5%, Si: ≤0.3%, Nb: 0.3~0.6%, W: ≤5.0%, Ti: 1.5~3.5%, Al: 1.5~3.5%, N: ≤0.03%, B: ≤0.003%, Zr: ≤0.03%, Re: ≤0.1% , the balance being Ni; smelting the pre-alloyed charge under the vacuum degree of no more than 0.3Pa; carrying out blank forging with a deformation amount of 70% in the temperature range of 70‑120 °C above the Ni3Al precipitation temperature; 'High-temperature rolling with a deformation amount of 80% is carried out at 120-160°C above the precipitation temperature. The process cost of the invention is low, and the alloy has excellent high-temperature mechanical properties above 750°C.

Description

technical field [0001] The invention belongs to the field of materials and material preparation, and specifically relates to a preparation process of high-alumina and titanium deformed superalloys, which can meet the requirements of super / reheaters, main steam pipes, and headers in thermal power plants; hydrogen conversion furnaces in chemical plants, and ethylene cracking. The performance requirements of materials for key components serving in high-temperature and low-stress environments such as furnaces. Background technique [0002] Superalloys have attracted widespread attention due to their excellent high-temperature strength, corrosion / oxidation resistance, and have been used in many fields such as energy and power, aerospace, and petrochemicals. According to the service conditions of components and their performance requirements, superalloys can be mainly divided into cast superalloys and deformed superalloys. Among them, by adopting different smelting process parame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C1/023C22C19/055C22F1/10
Inventor 严靖博杨征张醒兴谷月峰袁勇孙宇明张兴营于在松
Owner HUANENG POWER INT INC
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